case 2:
	{
	cout << "You have chosen Flat White. Please insert 6 PLN:" << endl;

	do{
        cin >> PLN || EURO || US;
	totalPLN=6-PLN;
		cout << "Please insert " << totalPLN << " more." << "You have entered: " << totalPLN << " so far." << endl;
    if(totalPLN==6)
    {
        cout << "Thanks. Here's your coffee." << endl;
    }
		}while (totalPLN<6);
	}
	break;